Operating Systems Quiz

Question 1

What is the key difference between a process and a thread?

Accepted Answer

Processes have separate address spaces; threads within a process share one

Answer

Threads have separate address spaces; processes share one

Answer

There is no difference

Answer

Threads cannot run concurrently

Question 2

Which scheduling algorithm can cause starvation of long jobs?

Accepted Answer

Shortest Job First (SJF)

Answer

First-Come First-Served (FCFS)

Answer

Round Robin

Answer

FIFO

Question 3

Which of these is NOT one of the four necessary conditions for deadlock?

Accepted Answer

Preemption

Answer

Mutual exclusion

Answer

Hold and wait

Answer

Circular wait

Question 4

A page fault occurs when…

Accepted Answer

The referenced page is not currently in physical memory

Answer

A page is corrupted on disk

Answer

Two processes access the same page

Answer

The page table is full

Question 5

What problem does the Banker’s algorithm address?

Accepted Answer

Deadlock avoidance

Answer

Page replacement

Answer

CPU scheduling

Answer

Disk scheduling

Question 6

Which page-replacement algorithm can suffer from Belady’s anomaly?

Accepted Answer

FIFO

Answer

LRU

Answer

Optimal

Answer

LFU

Question 7

A semaphore initialized to 1 and used for mutual exclusion is called a…

Accepted Answer

Binary semaphore (mutex)

Answer

Counting semaphore

Answer

Spinlock

Answer

Monitor

Question 8

What causes thrashing?

Accepted Answer

A high degree of multiprogramming with insufficient frames, causing constant paging

Answer

Too few processes in memory

Answer

A very fast CPU

Answer

Using LRU instead of FIFO

Question 9

In a demand-paging system, the effective access time depends most on…

Accepted Answer

The page-fault rate

Answer

CPU clock speed

Answer

The number of registers

Answer

The scheduler quantum

Question 10

What is a context switch?

Accepted Answer

Saving the state of one process/thread and restoring another’s

Answer

Switching between user and kernel mode

Answer

Changing the CPU frequency

Answer

Flushing the disk cache

Operating Systems quiz

What is the key difference between a process and a thread?

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